Bently Nevada 140734-02 Proximitor Seismic Monitor

Product Specification

140734-02 Proximitor Seismic Monitor

Brand Name:Bently Nevada

Product Name:140734-02

Warranty:1Year

Key Parameters

Core Features & Advantages

• Versatile Dual-Mode Monitoring: The module's standout feature is its ability to accept input from both proximity probes and seismic transducers in a single unit. This allows a single monitor to handle radial vibration, thrust position, and casing vibration measurements, reducing spare parts inventory and rack space requirements .

• Comprehensive Measurement Suite: Each channel can be programmed via the 3500 Rack Configuration Software to perform multiple functions simultaneously. Supported measurements include radial vibration, thrust position, differential expansion, eccentricity, REBAM® (Rolling Element Bearing Activity Monitoring), acceleration, velocity, and shaft absolute .

• Configurable Alarm Protection: The module continuously compares conditioned signals against user-programmable Alert and Danger setpoints, providing real-time machinery protection. Time delays (1 to 60 seconds) are configurable to prevent nuisance trips .

• Buffered Transducer Outputs: Front-mounted coaxial connectors provide short-circuit protected buffered outputs for each channel, enabling external signal analysis, troubleshooting, and connection to diagnostic equipment without interrupting the monitoring function .

• Functional Safety Capability: Functional Safety (FS) versions of the 3500/42M can be used in 2-out-of-3 (TMR) configurations for SIL 3 safety functions, making it suitable for critical machinery protection applications .

Typical Applications

The 140734-02 is widely used for continuous machinery protection in heavy industries :

• Oil & Gas: Large centrifugal and reciprocating compressors, turbine expanders, and pump sets in refineries and LNG facilities

• Power Generation: Steam turbines, gas turbines, generators, and boiler feed pumps

• Petrochemical: Mixers, extruders, and large industrial fans

• Heavy Industry: Ball mills, blast furnace blowers, and rolling mills

Frequently Asked Questions (FAQ)

Q1: What is the primary function of the 140734-02?
A: It is a 4-channel Proximitor/Seismic Monitor that accepts inputs from proximity and seismic transducers, conditions the signals to measure vibration and position parameters, and compares them against user-programmable alarm setpoints for machinery protection .

Q2: What does the 140734-02 monitor?
A: It monitors radial vibration, thrust position, differential expansion, eccentricity, REBAM®, acceleration, velocity, shaft absolute, and circular acceptance region .

Q3: Can the 140734-02 be used for SIL 3 applications?
A: Yes. Functional Safety (FS) versions of the 3500/42M can be used in a 2-out-of-3 (TMR) configuration for SIL 3 safety functions .

Q4: Does the 140734-02 provide buffered outputs?
A: Yes. It provides buffered transducer outputs for each channel via front-mounted coaxial connectors (short-circuit protected) to allow for external signal analysis and troubleshooting .

Q5: What is the significance of the "Bias Current Check" feature?
A: The Bias Current Check validates loop integrity of eddy-current proximity probe systems by monitoring bias current. It should be disabled when using seismic sensors, third-party sensors, 4-20mA transmitter inputs, or other non-Bently probe sources, as these lack the bias current characteristics the check expects .

Q6: Is the 140734-02 still available for new projects?
A: This is a legacy 3500-series module. According to supplier information, it is end-of-life, with only surplus and refurbished spare units available for maintenance of existing machinery-protection racks .

Q7: What are the key LED indicators on the module?
A: The module features three front-panel LEDs: OK (proper operation), TX/RX (communication with other modules), and Bypass (module in bypass mode) .

Q8: Can third-party proximity probes be used with this module?
A: While the monitor can physically read voltage from third-party probes, doing so voids API 670 compliance and risks inaccurate vibration/position readings due to differences in sensitivity, linearity, and coil impedance. Only certified Bently Nevada probe-cable-driver systems should be used .

Recommended Models & Related Products

The 140734-02 is part of the 3500/42M Proximitor/Seismic Monitor family. Below are related models and components:

Choosing the Right Model

• For combined proximity and seismic monitoring: The 140734-02 (3500/42M) is the correct choice for applications requiring both probe-based and seismic-based vibration measurements in a single module.

• For proximity-only applications: Consider the 3500/40M Proximitor Monitor if seismic inputs are not required.

• For system integration: Pair with the 3500/33 Relay Module for alarm/trip logic and the 3500/22M TDI for System 1 data communication.